System, method, and computer program for enabling a user to access and edit via a virtual drive objects synchronized to a plurality of synchronization clients

ABSTRACT

A system, method, and computer program for enabling a user to edit and access local and remote objects via a virtual drive, including objects synchronized to a plurality of synchronization clients. A virtual drive is displayed on the user&#39;s local client device with all objects, which a user has synchronized to a synchronization server. A user is able to access and edit any object displayed in the virtual drive. In response to detecting a change in an object in the virtual drive, the object is updated on the synchronization server. All remote clients of the user or of any other users who have access to the changed folder are identified and notified of the change. In response to the change being a change to content within the folder, the content of the folder is automatically updated on any identified remote clients that have a corresponding folder.

CROSS REFERENCE TO OTHER APPLICATIONS

This present application is a continuation of U.S. patent application Ser. No. 15/992,342, filed May 30, 2018, which is a continuation of U.S. patent application Ser. No. 14/873,004, filed Oct. 1, 2015, which is a continuation of U.S. patent application Ser. No. 13/571,512, filed Aug. 10, 2012 which issued as U.S. Pat. No. 10,057,318. Each of the aforementioned applications are hereby incorporated by reference in their entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

This invention relates generally to a synchronization system and, more particularly, to a system and method for enabling a user to access and edit, via a virtual drive, objects synchronized to a plurality of synchronization clients.

2. Description of the Background Art

Many users have multiple computing devices, such as a home computer, a work computer, and a mobile phone. Different files may be stored by synchronization software clients on different devices. Virtual drives enable a user to back up files on a computer to a server and have remote access to files stored on the server, presented as though the files exist on a locally mounted file system. However, in a synchronization system, a user may have synchronized an object to multiple clients, and known virtual drives do not enable a user to make a change to a remote file and then have that change automatically synchronized across multiple clients. As an example, User A has a folder that resides on his work and home computer. User A has also shared that folder with User B. User A desires not only to be able to remotely access the folder from another synchronization software client via a virtual drive, but also to have any changes made to the folder via the virtual drive automatically synchronized to his home and work computer, as well as any client devices of User B that have a corresponding copy of the folder. Therefore, there is a need for a system and method for enabling a user to access and edit via a virtual drive objects synchronized to a plurality of synchronization clients.

SUMMARY OF THE INVENTION

The present invention is directed to a synchronization system, method, and computer program for enabling a user to access and edit, via a virtual drive, local and remote objects, including objects synchronized to a plurality of synchronization software clients. The present invention enables a user to make a change to an object via a virtual drive and have that change automatically synchronized to a plurality of synchronization clients.

The method includes enabling a user to synchronize one or more objects using a synchronization software client, a synchronization server, and other synchronization clients. Objects may be folders, music files, video files, images, contacts, calendar items, and other types of electronic files or items. All objects, across a plurality of synchronization clients that a user has synchronized to the synchronization server, are identified. A virtual drive is displayed on the user's local client device with the identified objects. The virtual drive appears as a separate disk drive on the user's local client device and includes objects that reside on one or more remote clients. A user is able to access and edit any object displayed in the virtual drive, including objects that reside only on remote clients. In response to detecting a change in an object in the virtual drive, the object is updated on the synchronization server. All remote synchronization clients of the user are identified in the synchronization system, as well as all remote synchronization clients, if any, of other users whom have access to the changed object. The identified synchronization clients are notified of the change to the object. In response to the change being a change to content within the object, the content of the object is automatically updated on any identified remote clients that have a corresponding object.

In certain embodiments, a user is able to create a collection that comprises items across a plurality of synchronization clients that share one or more specified attributes, regardless of the folder(s) in which the items reside. The collection is displayed in the virtual drive. A user is able to access and edit items within the collection. In response to a user editing an item within a collection, a folder is identified in which the item resides. The folder is updated on the synchronization server with the edit to the item. All remote synchronization clients of the user in the synchronization system are identified, as well as all remote synchronization software clients, if any, of other users whom have access to the changed folder. The identified clients are notified of the change to the folder. In response to the change being a change to content within the folder, the content of the folder is automatically updated on any identified remote clients that have a corresponding folder. In certain embodiments, the items in the collection are not limited to files organized within folders on a file system, but are arbitrary objects existing within an arbitrary organizational scheme.

The attributes may be specified by the user, other software programs, or the synchronization system. The attributes may include one or more of the following: location associated with the file, version of the file, a time stamp associated with the file, client device on which the file resides, and the file type. The attributes may include a permission class associated with the shared files.

In one embodiment the user is able to perform share and synchronization functions via the virtual drive. The folders in the virtual drive may be organized by client device or may be client device-independent.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1a-1b are a flowchart that illustrates a method, according to one embodiment of the invention, for enabling a user to access and edit, via a virtual drive, local and remote objects, including objects synchronized to a plurality of synchronization software clients.

FIGS. 1c-1d are a flowchart that illustrates a further embodiment of the invention in which a user is able to view, access, and synchronize collections via a virtual drive.

FIG. 2 is a block diagram of a synchronization system according to one embodiment of the invention.

FIG. 3 is a block diagram of a synchronization system according to one embodiment of the invention.

FIGS. 4a-4b are a flowchart that illustrates a method for enabling a user to change a remote folder via the virtual drive according to one embodiment of the invention.

FIGS. 5-6 are screenshots of an exemplary user interface in a synchronization system according to one embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention provides a system, method, and computer program for enabling a user to access and edit, via a virtual drive, local and remote objects in a synchronization system, including objects synchronized to a plurality of synchronization software clients. Examples of synchronization systems are disclosed in (i) U.S. Pat. No. 7,885,925, titled “Method and Apparatus for File Sharing and Synchronization System,” and (ii) U.S. Pat. No. 8,019,900, titled “Opportunistic Peer to Peer Synchronization in a Synchronization System.” The contents of both of these patents are incorporated herein by reference as if fully disclosed herein. A person skilled in the art would understand that other synchronization systems may be used within the scope of the present invention.

As used herein, a virtual drive is a file system representation on the user's local client device, of data from a source that is external to the local file system. In the present invention, the virtual drive provides a file system representation, on the user's local client device, of all objects, across a plurality of clients including the local client, which a user has synchronized or otherwise saved to the synchronization system. In the preferred embodiment, a local sync database stores metadata about these objects, and this metadata is used to generate the virtual drive. As used herein, metadata is a collection of attributes that describe the state of an object and is used by the synchronization system to detect and orchestrate changes to the object.

As used herein, an object may be a folder, a file (e.g., a WORD document, an EXCEL spreadsheet, a POWERPOINT presentation, an email, contact, or calendar item, such as in MICROSOFT OUTLOOK), a media object (e.g., a video file, an audio or music file, an image file), or a collection. A person skilled in the art would understand that objects are not limited to the above-specified examples.

As used herein, a collection includes items, across a plurality of synchronization software clients, which share one or more specified attributes. An attribute is a property that the user can assign to any object or collection (e.g., client name). An attribute has an attribute value (i.e., the value that a user might assign to an attribute) and an attribute type (i.e., the data type of the attribute value). One example of a collection may be the user's recent photographs from Hawaii that are stored across the user's camera, mobile device, laptop, and home computer. Attributes may be specified automatically by the synchronization system, by another software program, or by the user. Types of attributes available for specification by the user include (i) permission class associated with a shared object, (ii) a file type associate with a file, (iii) a location associated with an object, (iv) version of the file, (v) time stamp associated with the file, (vi) client device on which the file resides, and (vii) an arbitrary attribute type defined by the user or other software program. A person skilled in the art would understand that other attributes may be assigned within the scope of the present invention.

FIGS. 1a-1b illustrate a method, according to one embodiment, for enabling a user to access and edit, via a virtual drive, local and remote objects in a synchronization system, including objects synchronized to a plurality of synchronization clients. In the preferred embodiment, the objects are folders that may contain documents (e.g., EXCEL, POWERPOINT, or WORD documents), email/calendar items, video files, and/or photos, but those skilled in the art will appreciate that the method of the present invention may be applied to other objects.

Referring to FIG. 1a , a user is enabled to synchronize one or more folders on any synchronization client to the synchronization server and other synchronization clients (step 105). All folders, across a plurality of synchronization clients that a user has backed up or synchronized to the synchronization server, are identified, as well as any folders that the user shares with other users (step 110). Each of the synchronization clients stores metadata with information on all folders shared with or by the user and all folders that the user has backed up or synced to the synchronization server (including the contents of the folder). The synchronization client on the client device uses this metadata to generate the virtual drive and the user interface.

A virtual drive is displayed on the user's local client device with the identified folders (step 115). The virtual drive appears as a separate disk drive on the user's local client device. The virtual drive includes all of the user's synced folders, regardless of whether a folder resides on the local client or only on a remote client. A user is enabled to access and edit any item within any folder displayed in the virtual drive, including folders that do not reside on the local client (step 120). In one embodiment, when a user double clicks on a file or item in a remote folder in the virtual drive, the server downloads its copy of the file/item to the local synchronization software client (i.e., the client currently being used by the user). The user can then edit the file/item as desired. In one embodiment, when a user double clicks on a local folder, the user is taken to the folder in the local file system view. In another embodiment, the server downloads its copy of the item/file in the local computer.

In response to detecting a change in a folder in the virtual drive, the folder is updated on the synchronization server (step 125). All remote clients of the user in the synchronization system are identified, as well as all remote synchronization clients, if any, of other users whom have access to the changed folder (step 130). In one embodiment, all synchronization clients that have an interest in updates to the folder “register” for notices of changes to the folder. The identified clients are notified of the change to the folder (step 135). In response to the change being a change to content within the folder, the content of the folder is automatically updated on any identified remote clients that have a corresponding folder. In one embodiment, the synchronization server first sends metadata to all the identified clients, notifying them of the change. The synchronization clients that have their own copy of the changed folder will then request the applicable file data from the server and the server will download the requested file data to the requesting synchronization clients.

FIGS. 1c-1d illustrate a further embodiment of the invention. In this embodiment, a user is enabled to create a collection that comprises items across a plurality of synchronization clients that share one or more specified attributes, regardless of the folder(s) in which the items reside (step 140). In certain embodiments, the collections and items within collections are not limited to files organized within folders on a file system, but are arbitrary objects existing within an arbitrary organizational scheme within an arbitrary data set.

The collection is displayed in the virtual drive (step 145). The collection may be displayed in the virtual drive as a folder, as a file, or as an object (e.g., a node). A user is enabled to access and edit items within the collection (step 150). In response to a user editing an item within a collection, a folder is identified in which the item resides (step 155). The folder is updated on the synchronization server with the edit to the item (step 160). All remote clients of the user in the synchronization system and all remote synchronization clients, if any, of other users whom have access to the changed folder are identified (step 165). The identified clients are notified of the change to the folder (step 170). In response to the change being a change to content within the folder, the content of the folder is automatically updated on any identified remote clients that have a corresponding folder. In the case where the items in the collection reside across an alternate organizational scheme (other than a file or folder system), the identified clients are notified of changes to any item. In response to the change being a change to content within the original physical or logical location, the content of the item is automatically updated on any identified remote clients that have a corresponding representation of the item.

The virtual drive may be organized by client device or may be client device-independent. A user may be able to perform share and synchronization management functions via the virtual drive. For example, a user may be able to right click on an object in the virtual drive to take a specific share action (e.g., share an object with another user or change the permission settings for another user with respect to the object) or alter the synchronization settings for the folder.

FIG. 2 illustrates an exemplary synchronization system 200 according to one embodiment. As a person skilled in the art would understand, the synchronization system 200 may be constructed in any number of ways within the scope of the present invention. The methods of FIGS. 1a-1d may be implemented in other systems, and the invention is not limited to system 200.

Synchronization system 200 includes a synchronization server (i.e., internet/network) 220, which provides synchronization and back up services to a plurality of end users. For example, all synchronized objects between a user's client devices and between users are stored on server 220 and are accessible from any client device having access to the server 220. Synchronization server 220 is representative of the server-side of a synchronization system and, in a large synchronization system, is likely a plurality of synchronization servers networked together. A person skilled in the art would understand that the synchronization system 200 may have any number of client devices, including one or more desktops, laptops, and mobile devices.

When a synchronization software client in the synchronization system detects a change to a local object, it notifies the synchronization server 220 of the change, and synchronization server 220 then modifies the corresponding object (and/or metadata related to the corresponding object) on the server as applicable. Server 220 notifies the user's other synchronization clients of the change, as well as any clients of other users with access to the changed object. If the content of the object has changed and a synchronization software client has a corresponding copy of the changed object, the synchronization software client requests the applicable content data from synchronizations sever 220.

Within client device 230 is local synchronization client software 240, which functions to synchronize client device 230 with the synchronization server 220. The local synchronization software 240 has a metadata manager 242 for receiving and sending change notices to and from synchronizations server 220. The metadata manager stores metadata about objects the user has synchronized or backed up to server 220 in the local sync database 245. Metadata for objects other users have shared with the user is also stored in the local sync database 245.

The local synchronization client software 240 includes a file data manager 243 for monitoring synchronized files (via operating system 255) on physical disk drive 260. Physical disk drive 260 stores the user's local files. When a user accesses a remote file via the virtual drive, a copy of such file is temporarily stored on a local physical disk drive 260. The file data manager 243 informs the metadata manager 242 if it detects a change to a synchronized object in physical disk drive 260. The metadata manager 242 then updates the applicable metadata in local sync database 245 and notifies server 220 of the change.

The local synchronization software 240 is operatively coupled to a file system abstraction module 250, within operating system 255. The operating system 255 is connected to one or more disk drives 260. The operating system 255 is also connected to a user interface 270 (e.g., MAC FINDER or WINDOWS EXPLORER) which displays the physical drive user interface 280 and the virtual drive user interface 290. The file system abstraction module 250 functions to process and normalize the metadata related to the synchronized objects so that the file system user interface module 270 is able to display the virtual drive 290.

The methods described with respect to FIGS. 1a-1d are embodied in software and performed by a computer system executing the software. A person skilled in the art would understand that a computer system has a memory or other physical, computer-readable storage medium for storing software instructions and one or more processors for executing the software instructions.

FIGS. 3-4 b illustrate a method for enabling a user to change a remote folder via the virtual drive according to one embodiment of the invention. The same method may be applied if a user changes a local folder. In FIG. 3, a synchronization server 320 communicates, via Internet/network 310, to four client devices, Client Device A, Client Device B, Client Device C, and Client Device D. Client Devices A-C belong to a first user (e.g., Elisabeth) and Client Device D belongs to a second user (e.g., Andrew). A person skilled in the art would understand that there may be more or less client devices connected to the cloud 310 within the scope of the present invention.

Each client device has a local synchronization client 340 a-340 d and a file system 350 a-350 d. Each file system stores one or more of Folders #1-9 on the local client device. For example, Client Device A has Folders #1-3 in its file system 350 a, Client Device B has Folders #1, 3, and 5-7 in its file system 350 b, Client Device C has Folders #3, 5, and 7 in its file system 350 c, and Client Device D has Folders #8-9 in its file system 350 d. In addition, the first user, Elisabeth, has shared Folder 5 with the second user, Andrew, which appears on the local synchronization client 340 d of Client Device D. Database 360 is connected to synchronization server 320 and has all folders (i.e., Folders #1-9) of all synchronized client devices stored on it.

In FIGS. 4a-4b , the virtual drives on Elisabeth's Client Devices (A, B, C) display Folders #1-7. The virtual drive on Andrew's Client Device D displays Folders #5 (shared), 8, and 9 (step 405). Elisabeth double clicks on a file in Folder #5 via the virtual drive on Client Device A, and Client Device A requests a copy of the file from the synchronization server 320 (step 410). The synchronization server 320 sends Client Device A a copy of the selected file (step 420). Elisabeth changes the file on Client Device A (step 425). The local synchronization client 340 a on Client Device A detects a change and notifies the synchronization server 320. The local synchronization client 340 a also updates the local sync metadata on Client Device A to reflect change (step 430). Examples of metadata include file attributes (e.g., permissions, time stamp of last change, file type, file name). The synchronization server 320 obtains the relevant file data from Client Device A and updates its copy of Folder #5 in the Synchronization Database 360 (step 435).

The synchronization server 320 identifies Client Devices B and C as belonging to Elisabeth. Synchronization server 320 identifies Client Device D as belonging to Andrew, with whom Elisabeth has shared Folder #5 (step 440). Synchronization server 320 notifies Client Devices B, C, and D of the change to Folder #5 (step 450). The local synchronization clients 340 b, 340 c, 340 d on Client Devices B, C, and D update the metadata for the virtual drive and synchronization user interface (step 460). The local synchronization clients 340 b, 340 c, 340 d on Client Devices B and C each realizes that they have a Folder #5 and requests relevant file data from synchronization server 320 (step 470). The synchronization server 320 sends file data to Client Devices B and C (step 480). Client Devices B and C update corresponding Folder #5 on Client Devices B and C (step 490).

FIGS. 5-6 illustrate screenshots of an exemplary user interface that enables a user to easily synchronize a folder to the synchronization system. A person skilled in the art would understand that the present invention may be embodied on other user interfaces having more or less functionality within the scope of the present invention. As such, FIGS. 5-6 are intended to be illustrative and not limiting in any way.

In FIG. 5, an exemplary user interface 500 for a synchronization system that functions with the virtual drive is provided. The user interface has a content view 505, a sharing view 510, an activity view 515, and a search button 520. The content view 505 has three tabs, a My Cloud tab 525, a Shared folders tab 530, and a Web link tab 535. A more detailed description of an exemplary user interface 500 may be found in U.S. patent application Ser. No. 13/571,564, filed on Aug. 10, 2012, by Andrew Garcia, et al. entitled “System, Method, and Computer Program for Enabling a User to Synchronize, Manage, and Share Folders Across a Plurality of Client Devices and a Synchronization Server,” which is incorporated by reference in its entirety.

FIG. 5 also illustrates a virtual drive on an exemplary file system user interface, such as the MAC FINDER on a MACINTOSH-based computer. The virtual drive may also be embodied on a WINDOWS-based computer, such as using WINDOWS EXPLORER. Folders 540 include folders, across the synchronization software clients of the user's client devices, that (i) the user has synchronized or backed up in the synchronization system, (ii) have been shared with the user, or (iii) the user has shared with other users. Any file in folders 540 may be accessed through the virtual drive 545, including files in folders located only on a remote synchronization software client or synchronization server 220. That means that the folders 540 may be viewed as if they resided on the hard drive of the local client device and the user may add, edit, delete, and move files within the folders 540, which would result in the files being added, edited, deleted, or moved in corresponding folders on remote synchronization software clients and the synchronization server. Not only are all of the user's folders, which have been synchronized, accessible through the virtual drive, but all of the folders 550 shared with the user by other users.

FIG. 6 illustrates how a file may be opened via the virtual drive 545. The user can choose a file from any folder 540 in the virtual drive 545. The user may choose whether to open the original or a copy 605. After the user modifies and saves the document, any changes are uploaded to the synchronization server 220 and a copy of the changed metadata is pushed to all synchronization software clients that have registered for notices of changes to the folder.

As will be understood by those familiar with the art, the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosure of the present invention is intended to be illustrative and not limiting of the invention. 

What is claimed is:
 1. A method, comprising: generating a collection comprising a plurality of references corresponding to a plurality of content items stored at multiple different file system locations within a content synchronization system; providing, for display on a client device, the collection comprising graphical elements corresponding to the plurality of content items; receiving, from a client device, a selection indication of a content item from the plurality of content items based on a user interacting with a graphical element corresponding to the content item within the collection; based on receiving the selection indication of the content item, identifying a file system location within the content synchronization system corresponding to the content item; and providing, to the client device, access to the content item.
 2. The method of claim 1, wherein: generating the collection comprises generating a collection data object that comprises the plurality of references corresponding to the plurality of content items; and each reference of the plurality of references indicates a file system location within the content synchronization system for each content item of the plurality of content items.
 3. The method of claim 1, wherein the plurality of content items stored at multiple different file system locations within a content synchronization system comprise: a first content item stored at a first file system location associated with a first user account; and a second content item stored at a second file system location associated with a second user account.
 4. The method of claim 1, further comprising: receiving, from the client device, an identification of an additional content item stored at a file system location associated with a user account corresponding to the client device; and adding the additional content item to the collection by adding an additional reference to the plurality of references of the collection.
 5. The method of claim 1, further comprising: receiving, from the client device, a user identification associated with a second client device; and sharing the collection with the second client device, wherein sharing the collection with the second client device allows the second client device to access the plurality of content items stored at the multiple different file system locations within the content synchronization system.
 6. The method of claim 1, further comprising: receiving, from the client device, an edit to the content item; updating the content item at the file system location corresponding to the content item.
 7. The method of claim 1, further comprising: identifying a plurality of user accounts with which the collection is shared; detecting a user action with respect to the collection or with respect to at least content item from the plurality of content items within the collection; and providing a notification of the user action to a plurality of client devices associated with the plurality of user accounts.
 8. A system, comprising: at least one processor; and a non-transitory computer readable medium comprising instructions that, when executed by the at least one processor, cause the system to: generate a collection comprising a plurality of references corresponding to a plurality of content items stored at multiple different file system locations within a content synchronization system, wherein each reference of the plurality of references indicates a file system location within the content synchronization system for each content item of the plurality of content items; provide, for display on a client device, the collection comprising graphical elements corresponding to the plurality of content items; receive, from a client device, a selection indication of a content item from the plurality of content items based on a user interacting with a graphical element corresponding to the content item within the collection; based on receiving the selection indication of the content item, identify a file system location within the content synchronization system corresponding to the content item; and provide, to the client device, access to the content item.
 9. The system of claim 8, wherein generating the collection comprises generating a collection data object that comprises the plurality of references corresponding to the plurality of content items.
 10. The system of claim 8, further comprising instructions that, when executed by the at least one processor, further cause the system to: detect a change from the file system location of the content item to an updated file system location; and update a reference from the plurality of references that corresponds to the content item to reflect the updated file system location.
 11. The system of claim 8, wherein the plurality of content items stored at multiple different file system locations within a content synchronization system comprise: a first content item stored at a first file system location associated with a first user account; and a second content item stored at a second file system location associated with a second user account.
 12. The system of claim 8, further comprising instructions that, when executed by the at least one processor, further cause the system to: receive, from the client device, an identification of an additional content item stored at a file system location associated with a user account corresponding to the client device; and add the additional content item to the collection by adding an additional reference to the plurality of references of the collection.
 13. The system of claim 8, further comprising instructions that, when executed by the at least one processor, further cause the system to: receive, from the client device, a user identification associated with a second client device; and share the collection with the second client device, wherein sharing the collection with the second client device allows the second client device to access the plurality of content items stored at the multiple different file system locations within the content synchronization system.
 14. The system of claim 8, further comprising instructions that, when executed by the at least one processor, further cause the system to: identify a plurality of user accounts with which the collection is shared; detect a user action with respect to the collection or with respect to at least content item from the plurality of content items within the collection; and provide a notification of the user action to a plurality of client devices associated with the plurality of user accounts.
 15. A non-transitory computer-readable medium storing instructions that, when executed by at least one processor, causes a computing device to: generate a collection comprising a plurality of references corresponding to a plurality of content items stored at multiple different file system locations within a content synchronization system, wherein each reference of the plurality of references indicates a file system location within the content synchronization system for each content item of the plurality of content items; provide, for display on a client device, the collection comprising graphical elements corresponding to the plurality of content items; receive, from a client device, a selection indication of a content item from the plurality of content items based on a user interacting with a graphical element corresponding to the content item within the collection; based on receiving the selection indication of the content item, identify a file system location within the content synchronization system corresponding to the content item based on a reference of the plurality of references that corresponds to the content item; and provide, to the client device, access to the content item.
 16. The non-transitory computer-readable medium of claim 15, wherein generating the collection comprises generating a collection data object that comprises the plurality of references corresponding to the plurality of content items.
 17. The non-transitory computer-readable medium of claim 15, wherein the plurality of content items stored at multiple different file system locations within a content synchronization system comprise: a first content item stored at a first file system location associated with a first user account; and a second content item stored at a second file system location associated with a second user account.
 18. The non-transitory computer-readable medium of claim 15, further comprising instructions that, when executed by the at least one processor, further cause the computing device to: receive, from the client device, an identification of an additional content item stored at a file system location associated with a user account corresponding to the client device; and add the additional content item to the collection by adding an additional reference to the plurality of references of the collection.
 19. The non-transitory computer-readable medium of claim 15, further comprising instructions that, when executed by the at least one processor, further cause the computing device to: receive, from the client device, a user identification associated with a second client device; and share the collection with the second client device, wherein sharing the collection with the second client device allows the second client device to access the plurality of content items stored at the multiple different file system locations within the content synchronization system.
 20. The non-transitory computer-readable medium of claim 15, further comprising instructions that, when executed by the at least one processor, further cause the computing device to: detect a change from the file system location of the content item to an updated file system location; and update a reference from the plurality of references that corresponds to the content item to reflect the updated file system location. 